Air freshener

ABSTRACT

An air freshener is disclosed. The air freshener includes a body case defining the air freshener, the body case having a filter installation opening formed in one side thereof, a filter housing disposed in the body case, a drawer including a frame forming therein a drawer opening, through which air passes, and a filter cover coupled to the frame for covering the filter installation opening, and a filter module separably located on the frame for filtering the air that has passed through the drawer opening. The drawer is configured to be withdrawn from the inner space of the filter housing through the filter installation opening.

CROSS-REFERENCE TO RELATED APPLICATION

This U.S. non-provisional patent application claims priority under 35 U.S.C. §119 of U.S. Provisional Application No. 62/248,463, filed on Oct. 30, 2015, U.S. Provisional Application No. 62/252,017, filed on Nov. 6, 2015, Korean Patent Application No. 10-2015-0156254, filed on Nov. 7, 2015, Korean Patent Application No. 10-2015-0185846, filed on Dec. 24, 2015, Korean Patent Application No. 10-2016-0037235, filed on Mar. 28, 2016, Korean Patent Application No. 10-2016-0037246, filed on Mar. 28, 2016, U.S. Provisional Application No. 62/355,118, filed on Jun. 27, 2016, Korean Patent Application No. 10-2016-0083227, filed on Jul. 1, 2016, and Korean Patent Application No. 10-2016-01113455 filed on Sep. 2, 2016, the entire contents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the invention

The present invention relates to an air freshener including a detachable filter module for filtering suctioned air.

2. Description of the Related Art

An air conditioner is classified as a cooler or a heater for controlling the temperature of air, an air freshener for removing foreign matter from air to maintain cleanliness of the air, a humidifier for supplying moisture to air, or a dehumidifier for removing moisture from air.

An air freshener includes a fan for suctioning and discharging air. The air freshener includes a filter module for filtering the suctioned air.

In some conventional air fresheners, the filter module is detachably mounted in the air freshener. The detachable filter module is separated from a main body of the air freshener to clean the filter module, and is then coupled to the main body of the air freshener to operate the air freshener.

SUMMARY OF THE INVENTION

It is a first object of the present invention to provide a structure for enabling a user to easily separate a detachable filter module from an air freshener and then couple the filter module to the air freshener.

It is a second object of the present invention to provide a structure for enabling a plurality of filters, which may constitute a detachable filter module, to be separated from an air freshener and coupled to the air freshener all at once.

It is a third object of the present invention to provide a drawer for supporting a filter module in the state in which the filter module is located in the drawer, the drawer having an opening that defines a filtering channel, the drawer being configured such that the filter module is detachably mounted in the drawer.

In the case in which the filter module includes an electric dust collector, if a portion of the body of a user, such as a hand, is inserted into an opening formed in an inlet port, through which air is introduced, during the operation of an air freshener, the user may receive an electric shock. It is a fourth object of the present invention to provide a structure for reducing the possibility of an electric shock when in use.

Objects of the present invention should not be limited to the aforementioned objects and other unmentioned objects will be clearly understood by those skilled in the art from the following description.

An air freshener according to the present invention includes a body case defining the air freshener, the body case forming a filter installation opening in one side thereof, and a filter housing disposed in the body case. The body case forms an external appearance of the air freshener.

In accordance with first to third aspects of the present invention, the air freshener includes a drawer including a frame forming therein a drawer opening, through which air passes, and a filter cover coupled to the frame for covering the filter installation opening, and a filter module separably located on the frame for filtering the air that has passed through the drawer opening. The drawer is configured to be withdrawn from the inner space of the filter housing through the filter installation opening.

The air freshener may be configured such that air passes through the drawer opening and the filter module in the upward-downward direction in the state in which the drawer is settled in the inner space of the filter housing.

The filter module may include a plurality of filters stacked so as to be separated from each other.

The frame may include a pair of side frames configured to slide relative to the filter housing in the forward-rearward direction, the drawer opening being defined between the side frames.

The filter cover may be disposed at front end portions of the side frames. The frame may include a rear frame for interconnecting rear end portions of the side frames and a front frame for interconnecting the front end portions of the side frames, the front frame being coupled to the rear surface of the filter cover.

The side frames, the rear frame, and the front frame may have location surfaces on which the filter module is located. The location surfaces of the side frames may be disposed at a height different from the height of at least one of the location surfaces of the rear and front frames.

The filter housing may include a pair of drawer guides disposed at opposite sides thereof for guiding the withdrawal and introduction of the frame. The drawer may include a pair of sliders disposed at opposite sides of the frame, the sliders being configured to move along the drawer guides.

The air freshener may further include a mesh filter configured to be withdrawn from the inner space of the filter housing independent of the drawer. The filter housing may further include a mesh filter guide for guiding the withdrawal and introduction of the mesh filter, the mesh filter guide being disposed between the drawer guides in the filter housing so as to be lower than the drawer guides.

The filter housing may further include a filter module guide disposed at the inner upper side thereof for guiding the movement of the upper surface of the filter module when the filter module is withdrawn and introduced together with the drawer.

One selected from between each drawer guide and a corresponding slider may include a roller, and the other selected from between the drawer guide and the slider may include a rail, which the roller contacts. In this case, the rail may include a first section and a second section in order to smoothly withdraw and introduce the drawer and to prevent the formation of a vertical gap in the state in which the drawer is settled.

The filter module may include an electric dust collector. In this case, in accordance with a fourth aspect of the present invention, the filter housing may include a first cutoff switch and a second cutoff switch for enabling or disabling the supply of power to the electric dust collector, the first cutoff switch and the second cutoff switch being connected to each other in series to enable the supply of power to the electric dust collector only when both are pushed. The electric dust collector may include a first cutoff protrusion protruding from the electric dust collector for pushing the first cutoff switch. In addition, the mesh filter may include a second cutoff protrusion protruding from the mesh filter for pushing the second cutoff switch.

The frame may be coupled to the lower part of the filter cover, and the filter cover may extend perpendicular to the frame.

The filter cover may include a front part having a grip, a rear part that contacts the front surface of the filter module, and a top part disposed between the rear part and the front part, the top part facing the inner upper surface of the filter housing.

The filter cover may include a catch device. The filter cover may include an upper extension formed so as to be higher than the filter installation opening by a predetermined distance, the upper extension forming a sensor hole. In this case, the air freshener may further include a sensor module disposed at the rear side of the upper extension for sensing specific information from air introduced through the sensor hole.

The body case may include a depression formed so as to be engaged with the upper extension in the state in which the drawer is settled in the inner space of the filter housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view showing an air conditioner according to an embodiment of the present invention;

FIG. 2 is an exploded perspective view showing a humidifier of FIG. 1;

FIG. 3 is a vertical sectional view showing the air conditioner of FIG. 1;

FIG. 4 is an exploded perspective view showing a body of FIG. 1;

FIG. 5 is an exploded perspective view showing the body of FIG. 4;

FIG. 6 is a perspective view showing the body of FIG. 1 and a filter assembly separably coupled thereto;

FIG. 7 is a perspective view showing the filter assembly of FIG. 6;

FIG. 8 is a bottom view showing the filter assembly of FIG. 7;

FIG. 9 is a vertical sectional view taken along line A1-A1' of FIG. 8;

FIG. 10 is an exploded perspective view showing the filter assembly of FIG. 7;

FIG. 11 is a front view showing the body of FIG. 6 in the state in which the filter assembly is separated from the body;

FIG. 12 is a vertical sectional view showing the body of FIG. 11, and is a sectional view taken along line A2-A2′ of FIG. 11;

FIG. 13 is a vertical sectional view showing the body of FIG. 11, and is a sectional view taken along line A3-A3′ of FIG. 11;

FIG. 14 is a perspective view of the body of FIG. 11, showing the structure of guides in the filter housing;

FIG. 15 is a perspective view of the body of FIG. 11, showing the structure of another guide in the filter housing;

FIG. 16 is a perspective view showing a drawer of FIG. 10;

FIG. 17 is a perspective view showing the drawer of FIG. 16 when viewed from another side;

FIG. 18 is a side elevation view showing the drawer of FIG. 16;

FIG. 19 is a sectional view taken along line A4-A4′ of FIG. 18;

FIG. 20 is a sectional view taken along line A5-A5′ of FIG. 18;

FIG. 21 is a front elevation view showing the drawer of FIG. 16;

FIG. 22 is a vertical sectional view showing the state in which a drawer guide of the filter housing of FIG. 14 and a slider of the drawer are disposed;

FIG. 23 is a sectional perspective view showing the state in which the drawer guide of FIG. 14 and the slider are disposed, specifically showing the point at which a roller contacts the slider when the front end of an opening of the drawer is disposed further forward than the front end of a mesh filter;

FIG. 24 is a conceptual view showing a circuit of an electric dust collector in the state in which the filter assembly of FIG. 6 is located in a space defined in the filter housing;

FIG. 25 is a conceptual view showing the circuit of the electric dust collector in the state in which the filter assembly of FIG. 6 is withdrawn from the filter housing;

FIG. 26 is a perspective view conceptually showing a circuit of an electrification unit shown in FIGS. 24 and 25;

FIG. 27 is an elevation view conceptually showing a circuit of a dust collection unit shown in FIGS. 24 and 25.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Exemplary embodiments of the present invention will be described with reference to the attached drawings.

The terms “upward,” “downward,” “forward,” “rearward,” “leftward,” and “rightward” mentioned in the following description are defined as shown in the drawings, particularly FIG. 1. However, the terms are used merely to clearly understand the present invention, and therefore the above-mentioned directions may be differently defined. The terms “upward,” “downward,” “forward,” “rearward,” “leftward,” and “rightward” are respectively denoted by reference symbols U, D, F, R, Le, and Ri shown in the drawings.

In the following description, the term “potential” means electrical potential energy. In the following description, the term “voltage” means the potential difference between two points. In the following description, the term “electrical connection” includes connection between two members via another conductor as well as direct contact between the two members. In the following description, the terms “first,” “second,” etc. are used only to avoid confusion between components, and do not indicate the sequence or importance of the components.

An air freshener according to the present invention may be used as a component of an air conditioner that is capable of cooling, heating, or humidifying a room or as an stand-alone device for freshening air. In the specification, an air freshener is described as being mounted in an air conditioner. However, the present invention is not limited thereto.

Referring to FIGS. 1 to 5, an air conditioner according to an embodiment of the present invention includes an air freshener 100 and a humidifier 200 mounted at the upper side of the air freshener 100. The air freshener 100 is disposed on the floor, and the humidifier 200 is disposed on the air freshener 100.

The air freshener 100 filters external air introduced thereinto, and supplies the filtered air to the humidifier 200. The air freshener 100 filters external air introduced thereinto to remove foreign matter and bad smells from the air and supplies the filtered air to the humidifier 200. The humidifier 200 humidifies the filtered air, and discharges the humidified air to the outside.

The humidifier 200 may be separated from the air freshener 100. A user may separate the humidifier 200 and the air freshener 100 from each other to clean the humidifier 200 and the air freshener 100. After the humidifier 200 is separated from the air freshener 100, the user may supply water into a water tank 30 disposed in the humidifier 200. The user may supply water to the humidifier 200 in the state in which the humidifier 200 is disposed on the air freshener 100.

The air freshener 100 has a suction channel 101, through which external air is suctioned into the air freshener 100. The air freshener 100 has a filtration channel 102, through which the suctioned air is filtered.

In the state in which the humidifier 200 is disposed on the air freshener 100, the air conditioner has a connection channel 103, through which the air filtered by the air freshener 100 is supplied to the humidifier 200. A portion of the connection channel 103 formed in the air freshener 100 is defined as a cleaning connection channel 104, and a portion of the connection channel 103 formed in the humidifier 200 is defined as a humidification connection channel 105. The air freshener 100 has the cleaning connection channel 104, and the humidifier 200 has the humidification connection channel 105.

The humidifier 200 has a humidification channel 106, through which the air having passed through the air freshener 100, i.e. the filtered air, is humidified. While passing through the humidification channel 106, the filtered air is humidified. A discharge channel 107 is formed at the downstream side of the humidification channel 106 such that the air treated by the air freshener 100 and the humidifier 200 is discharged to the outside through the discharge channel 107.

In this embodiment, air generally flows vertically in the air freshener 100 and the humidifier 200 although the direction in which air flows is changed somewhat in the air freshener 100 and the humidifier 200. Specifically, air flows from the lower side to the upper side in the air freshener 100 and the humidifier 200.

The air conditioner may include a display module 160 for indicating the operational state of the air freshener 100.

The air conditioner may include a grip 129 for lifting the humidifier 200.

The air freshener 100 includes a body 130 to guide the air suctioned through the suction channel 101 to the humidifier 200, a filter assembly 10 separably installed in the body 130 for filtering the suctioned air, and a blowing unit 20 disposed in the body 130 for providing pressure enabling the suctioned air to flow.

The air freshener 100 is installed on a base 112. The body 130 is spaced apart from the base 112 to define the suction channel 101. Since the body 130 is spaced apart from the base 112, external air may be suctioned through the entirety of the lower surface of the body 130. The air suctioned from the lower side of the air freshener 100 flows to the upper side of the air freshener 100. The air flows along the filtration channel 102 from the lower side to the upper side of the air freshener 100 against gravity.

External air is suctioned through the suction channel 101 in all directions of 360 degrees. A bridge frame 115 is provided between the body 130 and the base 112 such that the body 130 is spaced apart from the base 112. The bridge frame 115 couples the body 130 to the base 112 and supports the body 130.

The external air flows to a suction port 111 via the bridge frame 115. A plurality of bridges 114 is formed on the bridge frame 115 so as to extend upward and downward. The bridges 114 may be disposed close to each other so as to prevent a user's finger from entering the suction port 111.

The body 130 includes a body case 131, which defines the external appearance of the air freshener 100.

When the body 130 is cut along a plane perpendicular to the vertical direction, the body 130 may have a circular section.

The filter assembly 10 is separately coupled to the body 130. The filter assembly 10 may be separated from the body 130 in the horizontal direction. The filter assembly 10 may be inserted into or withdrawn from the body 130 in the forward-rearward direction. The filter assembly 10 may include a plurality of filters stacked vertically. The filters may be stacked such that the user can separate the filters from each other. The filter assembly 10 may include a drawer 400 for simultaneously moving the filters, a detailed description of which will follow.

The air freshener 100 includes a body case 131, which defines the external appearance of the air freshener 100. A filter installation opening 133 is formed in one side (the front side) of the body case 131. The air freshener 100 includes a filter housing 140, which is disposed in the body case 131.

The filter housing 140 has therein a space for separably receiving the filter assembly 10. The filter housing 140 is installed in the body 130. The filter housing 140 is fixed in the body 130. The filter housing 140 has therein a space, into which a filter module, such as an electric dust collector 500, may be inserted. The filter module may be introduced into the inner space of the filter housing 140 through the filter installation opening 133. The filter module may be withdrawn from the inner space of the filter housing 140 through the filter installation opening 133. The drawer 400 may be introduced into the inner space of the filter housing 140 through the filter installation opening 133. The drawer 400 may be withdrawn from the inner space of the filter housing 140 through the filter installation opening 133. The drawer 400 is introduced and withdrawn in the forward-rearward direction.

The filter housing 140 and the filter assembly 10 are coupled to each other to define the filtration channel 102. The upstream side of the filtration channel 102 is connected to the suction channel 101. The downstream side of the filtration channel 102 is connected to the connection channel 103. Specifically, the downstream side of the filtration channel 102 is connected to the cleaning connection channel 104.

The filter installation opening 133 is formed in one side (the front) of the body case 131. The filter assembly is inserted into the filter housing 140 through the filter installation opening 133. The filter assembly 10 includes a filter cover 413 for covering the filter installation opening 133.

A blowing unit housing 150 to guide air blown by the blowing unit 20 to the humidifier 200 is installed in the body 130. The blowing unit housing 150 is located at the upper side of the filter housing 140. The blowing unit housing 150 is fixed to the filter housing 140.

The blowing unit 20 is installed between the filter housing 140 and the blowing unit housing 150. The blowing unit 20 provides pressure enabling air to flow.

The filter assembly 10 is disposed perpendicular to the flow of air. The filter assembly 10 intersects the filtration channel 102. The filtration channel 102 extends in the vertical direction, and the filter assembly 10 is inserted and withdrawn in the horizontal direction.

The air suctioned through the suction channel 101 flows to the blowing unit 20 via the filter housing 140. The blowing unit 20 is disposed at the upper side of the filter housing 140. The blowing unit 20 suctions the air from the filtration channel 102 and discharges the suctioned air to the humidifier 200.

The blowing unit 20 includes a blowing motor 22 and a blowing fan 24. In this embodiment, the blowing motor 22 and the blowing fan 24 are disposed between the blowing unit housing 150 and the filter housing 140. The blowing motor 22 is disposed above the blowing fan 24.

The blowing motor 22 is installed at the blowing unit housing 150 so as to be supported by the blowing unit housing 150. The blowing fan 24 is assembled with the blowing motor 22. The blowing fan 24 is rotated by driving force of the blowing motor 22. The blowing fan 24 is disposed at the filter housing 140.

In order to minimize installation spaces, at least a portion of the blowing motor 22 may be inserted into the blowing unit housing 150, and at least a portion of the blowing fan 24 may be inserted into the filter housing 140.

The filtered air is suctioned into the blowing fan 24 through the center thereof, and is discharged from the blowing fan 24 in the circumferential direction. In this embodiment, the blowing motor 22 is disposed at the upper side of the blowing fan 24 in order to prevent interference with air. The blowing motor 22 is installed so as to deviate from the air channels.

The air discharged from the blowing fan 24 flows upward to the humidifier 200 via the filter housing 140 and the blowing unit housing 150.

The water tank 30 is disposed in the body 130 at the upper side of the blowing unit 20. The body 130 is provided with a water tank insertion space which is concave inward from the upper side thereof such that the water tank 30 can be inserted from above.

A humidification channel inlet 123, through which air passes, is formed in the circumference of the water tank insertion space. The humidification channel inlet 123 communicates with the interior of the water tank 30. In this embodiment, a humidification medium 50 containing a moisture source is disposed inside the humidification channel inlet 123.

A watering unit 40 for suctioning water from the water tank 30, raising the suctioned water upward, and spraying the raised water to the outside is installed in the water tank 30. A watering motor 42, which is the power source of the watering unit 40, is installed at the lower side of the water tank 30. The watering motor 42 is physically separated from the blowing motor 22. The blowing motor 22 and the watering motor 42 may be independently controlled.

The humidifier 200 includes a visible body 210 separably stacked on the air freshener 100, the visible body 210 being made of a see-through material, and a top cover assembly 230 separably coupled to the visible body 210. In this embodiment, the discharge channel 107 is defined between the top cover assembly 230 and the visible body 210. The discharge channel 107 is connected to the downstream side of the humidification channel 106. The connection channel 103 is connected to the upstream side of the humidification channel 106. The top cover assembly 230 is provided with a water supply channel 109, through which external water is supplied to the humidifier 200.

Referring to FIGS. 6 to 15, the filter installation opening 133 is formed in a portion of the outer circumference of the body 130. The inner space and the outer space of the filter housing 140 communicate with each other through the filter installation opening 133. The filter assembly 10 is introduced into the inner space of the filter housing 140 through the filter installation opening 133.

Guides 142, 146, and 147 may be formed on opposite sides of the inner surface of the filter housing 140 to guide the sliding of the filter assembly 10. The guides 142, 146, and 147 may include at least one upper surface 146 and 147 a, which provides a frictional surface for supporting the filter assembly 10. The guides 142, 146, and 147 may include at least one lower surface 142 for pushing the filter assembly 10 downward. The guides 142, 146, and 147 may include at least one roller 147 b or bearing. The guides 142, 146, and 147 may include a drawer guide 147 to guide the sliding movement of the drawer 400. The guides 142, 146, and 147 may include a mesh filter guide 146 to guide the sliding movement of a mesh filter 300. The guides 142, 146, and 147 may include a filter module guide 132 to guide the sliding movement of the upper surface of a filter module 350 and 500, which is located in the drawer (see FIGS. 14 and 15).

The left and right side surfaces (the side surfaces at which the guides are disposed) of the inner space of the filter housing 140 prevent the movement of the filter assembly 10 in the leftward-rightward direction.

The air freshener 100 includes a power terminal 148 for supplying power to the electric dust collector 500. The air freshener 100 includes a ground terminal 149 for grounding the electric dust collector 500. The power terminal 148 and the ground terminal 149 are disposed at the inner surface of the filter housing 140.

The power terminal 148 may include an electrification unit power terminal 148 a for supplying power to an electrification unit 510 and a dust collection unit power terminal 148 b for supplying power to a dust collection unit 540. The ground terminal 149 may include an electrification unit ground terminal 149 a for grounding the electrification unit 510 and a dust collection unit ground terminal 149 b for grounding the dust collection unit 540.

The drawer 400 includes a filter cover 413 for covering the filter installation opening 133. The filter cover 413 includes an upper extension 413 d, which is formed so as to be higher than the filter installation opening 133 by a predetermined distance. The upper extension 413 d is provided with a sensor hole 413 a.

The air freshener 100 may include a sensor module 135, 136, and 137 installed in the body 130. At least a portion of the sensor module 135, 136, and 137 is exposed to external air. The sensor module 135, 136, and 137 senses specific information from external air. The sensor module 135, 136, and 137 may be disposed in the body 130. The sensor module 135, 136, and 137 may be disposed at the upper side of the filter installation opening 133. The sensor module 135, 136, and 137 may be disposed so as to be visually hidden by the filter cover 413 in the state in which the filter assembly 10 is coupled to the body 130. The sensor module 135, 136, and 137 may be disposed at the rear side of the upper extension 413 d of the filter cover 413. The sensor module 135, 136, and 137 senses specific information from air introduced through the sensor hole 413 a. The blowing unit 20 may be controlled based on the information sensed by the sensor module 135, 136, and 137.

The sensor module 135, 136, and 137 may include a dust sensor 135 for sensing the concentration of dust in external air. The sensor module 135, 136, and 137 may include a humidity sensor 136 for sensing the humidity of external air. The sensor module 135, 136, and 137 may include a smell sensor 137 for sensing the smell of external air.

A depression 134, which is depressed from the outer circumference of the body 130 by a distance corresponding to the thickness of the upper extension 413 d of the filter cover 413, is formed in the upper part of the filter installation opening 133. The body case 131 includes a depression 134 formed so as to be engaged with the upper extension 413 d in the state in which the drawer 400 is settled in the inner space of the filter housing 140. The filter cover 413 is engaged with the depression 134 when coupled to the body 130. The upper extension 413 d is engaged with the depression 134 when coupled to the body 130. The state in which the drawer 400 is settled in the inner space of the filter housing 140 means the state in which the drawer 400 is fully introduced into the filter housing 140. That is, when the drawer 400 is being introduced into the filter housing 140 or the drawer 400 is being withdrawn from the filter housing 140, the drawer 400 is not settled in the inner space of the filter housing 140.

The sensor module 135, 136, and 137 may include a plurality of sensors. The sensors may be arranged horizontally. The sensors may be arranged horizontally at the rear of the depression 134.

The body case 131 has holes 135 a, 136 a, and 137 a, which are formed in front of the sensors. The holes, which are formed in front of the respective sensors, may be arranged horizontally in the depression 134.

A humidity sensor hole 136 a is formed in the depression 134. The humidity sensor 136 is disposed at the rear of the depression 134. The humidity sensor 136 is disposed at the rear of the humidity sensor hole 136 a. The humidity sensor hole 136 a may include a plurality of small holes, which are aggregated densely.

A smell sensor hole 137 a is formed in the depression 134. The smell sensor 137 is disposed at the rear of the depression 134. The smell sensor 137 is disposed at the rear of the smell sensor hole 137 a. The smell sensor hole 137 a may include a plurality of small holes, which are aggregated densely.

The body case 131 forms a cleaning hole 135 a for cleaning the interior of the dust sensor 135. The body case 131 is provided with an inlet hole 135 b, through which air is introduced into the dust sensor 135. The body case 131 is provided with an outlet hole 135 c, through which air is discharged from the dust sensor 135. The inlet hole 135 b, the cleaning hole 135 a, and the outlet hole 135 c are arranged upward in due order.

The dust sensor 135 may include a heating unit (not shown) for applying heat to air introduced into the dust sensor 135. The heating unit may be disposed in the inner space of the cleaning hole 135 a. When air is heated due to the heating unit, the air may flow upward by convection. Air is introduced through the inlet hole 135 b, and is discharged through the outlet hole 135 c, which is located above the inlet hole 135 b, by convection.

The dust sensor 135 is disposed at the rear of the depression 134. The dust sensor 135 is disposed at the rear of the holes 135 a, 135 b, and 135 c.

The sensor hole 413 a is formed in the portion of the filter cover 413 corresponding to the position of the dust sensor 135 such that external air is supplied to the dust sensor 135 even in the state in which the dust sensor 135 is covered by the filter cover 413. The sensor hole 413 a is formed at the position corresponding to at least one of the inlet hole 135 b and the outlet hole 135 c. The sensor hole 413 a is formed in the shape of a slit extending in the leftward-rightward direction. The sensors may be arranged in the longitudinal direction of the slit.

The sensor hole 413 a may be formed so as to correspond to the inlet hole 135 b and the outlet hole 135 c. The sensor hole 413 a may be formed at the position corresponding to each of the inlet hole 135 b and the outlet hole 135 c.

The sensor hole 413 a may extend in the direction in which the sensors are arranged. The sensor hole 413 a may be a slit extending in the horizontal direction.

A plurality of sensor holes 413 a may be formed. The sensor holes 413 a may be arranged vertically so as to be spaced apart from each other. The sensor holes 413 a may include a first sensor hole 413 a 1 and a second sensor hole 413 a 2, which is disposed under the first sensor hole 413 a 1. The first sensor hole 413 a 1 and the second sensor hole 413 a 2 may be formed side by side. The first sensor hole 413 a 1 may extend horizontally. The second sensor hole 413 a 2 may extend horizontally. The first sensor hole 413 a 1 extends in the direction in which the sensors are arranged. The second sensor hole 413 a 2 extends in the direction in which the sensors are arranged. The first sensor hole 413 a 1 is formed at the height corresponding to the outlet hole 135 c. The second sensor hole 413 a 2 is formed at the height corresponding to the inlet hole 135 b.

The upper extension 413 d may be provided to open and close the cleaning hole 135 a in response to the withdrawal and introduction of the drawer 400. The rear surface of the upper extension 413 d closes the cleaning hole 135 a in the state in which the drawer 400 is settled in the filter housing 140. The rear surface of the upper extension 413 d opens the cleaning hole 135 a in the state in which the drawer 400 is withdrawn from the filter housing 140.

The filter assembly 10 includes a filter module 500 and 350 for filtering air. The filter assembly 10 includes a drawer 400 for supporting the filter module 500 and 350. The filter assembly 10 includes a mesh filter 300 for filtering foreign matter from air when the air passes through a mesh.

The drawer 400 is provided so as to be withdrawn from the inner space of the filter housing 140 through the filter installation opening 133. The filter module 500 and 350 is located in the drawer 400. The filter module 500 and 350 is provided so as to be withdrawn from the inner space of the filter housing 140 together with the drawer 400 through the filter installation opening 133.

The drawer 400 supports at least a portion of the filter module 500 and 350. The drawer 400 slides along the drawer guide 147 of the filter housing 140. The drawer 400 has a drawer opening 400 a, through which air passes. The drawer opening 400 a is formed in the horizontal plane. Air suctioned through the suction channel 101 passes vertically through the drawer opening 400 a. Air passes upward through the drawer opening 400 a.

The drawer 400 includes a frame 410, in which the drawer opening, through which air passes, is formed. The drawer 400 includes a filter cover 413 for covering the filter installation opening 133. The filter installation opening 133 is coupled to the frame 410.

The frame 410 may be disposed at the lower side of the drawer 400. The filter cover 413 is disposed at the front of the drawer 400. The filter cover 413 is coupled to the front end of the frame 410. The frame is coupled to the lower part of the filter cover 413. The filter cover 413 may extend perpendicular to the frame 410. The frame 410 may be disposed in the horizontal plane. The filter cover 413 may be disposed in the same plane as the outer surface of the body case 131.

The filter module 500 and 350 is separably located on the frame 410. The filter module 500 and 350 filters the air that has passed through the drawer opening 400 a. Air passes through the drawer opening 400 a and the filter module 500 and 350 in the upward-downward direction in the state in which the drawer 400 is settled in the inner space of the filter housing 140. Air passes upward through the drawer opening 400 a and is then filtered by the filter module 500 and 350 while passing through the filter module 500 and 350. The filter module 350 and 500 may include a plurality of filters stacked so as to be separated from each other. The filter module 350 and 500 may include an electric dust collector 500. The filter module 350 and 500 may include a photo-catalyst filter 350.

The electric dust collector 500 electrifies dust particles in the air and collects the electrified dust particles so as to filter the air.

The photo-catalyst filter 350, which is formed by applying a photo-catalyst having a deodorization function to a porous base, physically/chemically removes smell components from air.

The photo-catalyst filter 350 includes a photo-catalyst filter frame 353 disposed on the circumference of the filtration channel 102 and a photo-catalyst operation unit 355 supported by the photo-catalyst filter frame 353. The photo-catalyst operation unit 355 may be manufactured by applying a well-known photo-catalyst having a deodorization function to a base member having an aperture, which forms a portion of the filtration channel 102. Alternatively, the photo-catalyst operation unit 355 may be manufactured by forming an aperture in a member having a photo-catalyst property.

The photo-catalyst may include activated carbon. Smell particles may be collected by the photo-catalyst operation unit 355 due to physical adhesive force of the activated carbon. The smell particles may be collected by the photo-catalyst operation unit 355 via chemical coupling using the activated carbon or other photo-catalysts. The photo-catalyst filter 350 may be separated from the body 130 and the filter assembly 10 and may be exposed to the sun such that the smell particles are removed from the photo-catalyst operation unit 355.

The drawer 400 may support the electric dust collector 500. The electric dust collector 500 may support the photo-catalyst filter 350. The mesh filter 300, the electric dust collector 500, and the photo-catalyst filter 350 may be sequentially disposed from the upstream side to the downstream side in the direction A in which air flows. The mesh filter 300 may be disposed at the lowermost part of the filter assembly 10, the electric dust collector 500 may be disposed at the upper side of the mesh filter 300, and the photo-catalyst filter 350 may be disposed at the uppermost part of the filter assembly 10.

The filter module 350 and 500 may be separably located in the drawer 400. The electric dust collector 500 may be separably located in the drawer 400. The photo-catalyst filter 350 may be separably located at the upper side of the electric dust collector 500.

The mesh filter 300 is withdrawn from the inner space of the filter housing 140 independent of the drawer 400.

The mesh filter 300 is disposed in the direction in which an inlet port 506 of the electric dust collector 500 is formed.

The mesh filter 300 is disposed at the lower side of the electric dust collector 500. The mesh filter 300 is disposed in the direction in which an electrification unit 510 of the electric dust collector 500 is disposed. The mesh filter 300 is disposed in the direction in which an inlet port 506 of the electric dust collector 500 is formed. The electric dust collector 500 is stacked on the mesh filter 300.

The mesh filter 300 is disposed at the lower side of the drawer 400. The mesh filter 300 is provided so as to be introduced or withdrawn independent of the drawer 400. The mesh filter 300 is provided so as to be introduced or withdrawn independent of the electric dust collector 500. Only one of the electric dust collector 500 and the mesh filter 300 may be introduced into or withdrawn from the filter housing 140.

The mesh filter 300 includes a mesh filter cover 313, which defines the front thereof. The mesh filter cover 313 defines a surface that is continuously connected to the front surface of the filter cover 413 in the state in which the mesh filter 300 and the drawer 400 are settled in the filter housing 140. The mesh filter cover 313 has a mesh filter cover grip 313 a, which is depressed downward in the upper surface thereof.

The filter cover 413 has a grip exposure part 413 c, which is depressed in a portion of the lower end thereof such that the mesh filter cover grip 313 a is exposed to the outside in the state in which the mesh filter 300 and the drawer 400 are settled in the filter housing 140. The front surface and the lower surface of the grip exposure part 413 c are open. The grip exposure part 413 c may be depressed rearward from the front surface of the filter cover 413 to the rear end of the mesh filter cover grip 313 a. The user may put his/her hand in the grip exposure part 413 c so as to hold the mesh filter cover grip 313 a.

The mesh filter 300 includes a mesh frame 315 disposed along the circumference of the filtration channel 102 in the horizontal plane at the rear of the mesh filter cover 313. The mesh filter 300 may include an auxiliary mesh frame 316 disposed inside the mesh frame 315 for dividing the horizontal section of the filtration channel 102. The auxiliary mesh frame 316 divides the horizontal section of the filtration channel 102 into a plurality of parts.

The mesh filter 300 includes a mesh 318 for filtering and collecting foreign matter from air passing therethrough. The mesh 318 is supported by the mesh frame 315 and the auxiliary mesh frame 316. The mesh 318 is disposed in the same plane as the mesh frame 315 and the auxiliary mesh frame 316. The mesh filter 300 may be separated from the body 130 and may be washed to remove the foreign matter, collected by the mesh 318, from the mesh 318.

Referring to FIGS. 16 and 21, the frame 410 includes a pair of side frames 410 a configured to slide relative to the filter housing 140 in the forward-rearward direction. The drawer opening 400 a is defined between the side frames 410 a. The side frames 410 a extend in the forward-rearward direction. The filter cover 413 is disposed at the front end portions of the side frames 410 a. The side frames 410 a are disposed at the lower side of the filter module 350 and 500. The side frames 410 a are disposed at the upper side of the mesh filter 300.

The frame 410 may include a rear frame 410 b for interconnecting the rear end portions of the side frames 410 a. The rear frame 410 b extends in the leftward-rightward direction. The left end of the rear frame 410 b is coupled to the rear end of the left side frame 410 a. The right end of the rear frame 410 b is coupled to the rear end of the right side frame 410 a. The drawer opening 400 a is defined between the rear frame 410 b and the filter cover 413. The rear frame 410 b is disposed at the lower side of the filter module 350 and 500. The rear frame 410 b is disposed at the upper side of the mesh filter 300.

The frame 410 may include a front frame 410 c for interconnecting the front end portions of the side frames 410 a. The front frame 410 c is coupled to the rear surface of the filter cover 413. The front frame 410 c extends in the leftward-rightward direction. The left end of the front frame 410 c is coupled to the front end of the left side frame 410 a. The right end of the front frame 410 c is coupled to the front end of the right side frame 410 a. The drawer opening 400 a is defined between the rear frame 410 b and the front frame 410 c. The front frame 410 c is disposed at the lower side of the filter module 350 and 500. The front frame 410 c is disposed at the upper side of the mesh filter 300.

The frame 410 has a location surface 411 on which the filter module 350 and 500 is located. The location surface 411 has an upper surface for supporting the filter module 350 and 500. The location surface 411 may be formed on each of the left and right sides of the frame 410. A portion of the lower surface of the filter module 350 and 500 contacts the location surface 411 such that the filter module 350 and 500 is supported by the location surface 411.

The filter module 350 and 500 is separably located on the frame 410. The electric dust collector 500 may be separably located on the frame 410. The side frames 410 a, the rear frame 410 b, and the front frame 410 c define the location surface 411, on which the filter module 350 and 500 is located. The side frames 410 a have first location surfaces 411 a that contact the lower surface of the filter module 350 and 500. The rear frame 410 b has a second location surface 411 b that contacts the lower surface of the filter module 350 and 500. The front frame 410 c has a third location surface 411 c that contacts the lower surface of the filter module 350 and 500. The location surface 411 may include the first location surfaces 411 a, the second location surface 411 b, and the third location surface 411 c.

The drawer opening 400 a may be formed in the central part of the location surface 411. The first location surfaces 411 a, the second location surface 411 b, and the third location surface 411 c may be arranged so as to surround the drawer opening 400 a. A guide member (not shown) protruding upward along the circumference of the location surface 411 for contacting the side surface of the filter module 350 and 500 may be included. The guide member guides the location of the filter module 350 and 500 such that the filter module 350 and 500 contact the location surface 411.

The location surfaces 411 a of the side frames 410 a may have heights different from the height of at least one of the location surface 411 b of the rear frame 410 b and the location surface 411 c of the front frame 410 c. The location surfaces 411 a of the side frames 410 a may be disposed at higher positions than the location surface 411 b of the rear frame 410 b. The location surfaces 411 a of the side frames 410 a may be disposed at higher positions than the location surface 411 c of the front frame 410 c. The lower surface of the filter module 350 and 500 is formed so as to be engaged with the location surfaces 411 a, 411 b, and 411 c, which are formed so as to have different heights, as described above.

The filter cover 413 includes a front part 4131, which defines the front thereof. The sensor hole 413 a is formed in the front part 4131. The front part 4131 includes a filter cover grip 413 b. The filter cover grip 413 b may be formed as the result of a portion of the front part 4131 being depressed rearward. When the filter cover grip 413 b is pulled, the drawer 400 is pulled. A catching release button 417 b, a description of which will follow, may be disposed at the filter cover grip 413 b. The front part 4131 may have a grip exposure part 413 c, a description of which will follow. The front part 4131 may be formed so as to have a shape that extends to the outer surface of the body case 131. The front part 4131 may be curved so as to protrude forward when viewed in horizontal section. The front part 4131 includes an upper extension 413 d disposed at the upper part thereof.

The filter cover 413 includes a rear part 4132 that contacts the front surface of the filter module 350 and 500. The rear part 4132 defines at least a portion of the rear surface of the filter cover 413. The rear part 4132 guides the position of the front surface of the filter module 350 and 500. The rear part 4132 is formed so as to have a shape corresponding to the shape of the front surface of the filter module 350 and 500. In this embodiment, the front surface of the filter module 350 and 500 is a vertical surface, and the rear part 4132 has a vertical surface.

The filter cover 413 may include a top part 4133 that faces the inner upper surface of the filter housing 140. The top part 4133 is disposed between the rear part 4132 and the front part 4131. A catching part 417 a, a description of which will follow, is disposed at the top part 4133. The filter housing 140 is provided with a catching recess 143, which is formed at the position of the filter housing 140 corresponding to the catching part 417 a such that the catching part 417 a is caught in the catching recess 143. The rear end of the top part 4133 may be connected to the upper end of the rear part 4132. The front end of the top part 4133 is connected to the rear of the front part 4131.

The front end of the top part 4133 is connected to the lower end of the upper extension 413 d.

Referring to FIG. 9, the drawer 400 includes a catch device 417 for enabling the drawer 400 to be located and caught in the filter housing 140. The catch device 417 fixes the drawer 400 in the state in which the drawer 400 is settled in the filter housing 140. The catch device 417 may be disposed at the filter cover 413.

The catch device 417 includes a catching part 417 a for allowing the drawer 400 to be caught by the filter housing 140 in the state in which the drawer 400 is settled in the filter housing 140. The catching part 417 a is disposed at the top part 4133. The catching recess 143 is formed in the inner upper surface of the filter housing 140. The catching part 417 a protrudes upward. The upper end of the catching part 417 a is disposed at a higher position than the top part 4133. The rear surface of the catching part 417 a is inclined such that the rear surface is gradually close to the rear in the downward direction. During the introduction of the drawer 400 in the rearward direction, the inclined surface is pushed by the upper end of the filter installation opening 133, with the result that the catching part 417 a moves downward. The catching part 417 a is inserted into the catching recess 143 and moves upward in the state in which the drawer 400 is settled in the filter housing 140. In the state in which the catching part 417 a is inserted into the catching recess 143, the drawer 400 is not withdrawn even when the drawer 400 is pulled forward.

The catch device 417 may include a catching release button 417 b for moving the catching part 417 a downward to release the caught state of the catching part 417 a in the state in which the catching part 417 a is inserted into the catching recess 143. The catching release button 417 b releases the caught state of the catching part 417 a. The catching part 417 a and the catching release button 417 b are structurally connected to each other. When the catching release button 417 b is pushed, the catching part 417 a may move downward. The catching release button 417 b may be pushed downward. The catching release button 417 b may be disposed at the lower surface of the filter cover grip 413 b.

The catch device 417 may include an elastic part 417 c for applying restoring force upward when pushed downward. The elastic part 417 c may be disposed at the lower side of the catching release button 417 b. The elastic part 417 c may support the lower surface of the catching release button 417 b.

Hereinafter, the sliding structure between the filter housing 140 and the drawer 400 and the sliding structure between the filter housing 130 and the mesh filter 300 will be described with reference to FIGS. 14, 15, 17 to 20, 22, and 23.

The filter housing 140 includes a pair of drawer guides 147 disposed at opposite sides thereof. The drawer guides 147 guide the withdrawal and introduction of the frame 410. The drawer 400 includes a pair of sliders 414 disposed at opposite sides of the frame 410. The sliders 414 move along the drawer guides 147. The sliders 414 are movably supported by the drawer guides 147. The sliders 414 are formed at the lower sides of the side frames 410 a.

Each of the drawer guides 147 may include a rail 147 a. Each of the drawer guides 147 may include a roller 147 b. The rail 147 a may extend in the forward-rearward direction. The rail 147 a has an upper surface that contacts a corresponding one of the sliders 414. The roller 147 b may be disposed at the front end of each of the drawer guides 147. A rotary shaft of the roller 147 b extends in the leftward-rightward direction. The roller 147 b of each of the drawer guides 147 contacts a rail 414 a of a corresponding one of the sliders 414.

Each of the sliders 414 may include a rail 414 a. Each of the sliders 414 may include a roller 414 b. The rail 414 a may extend in the forward-rearward direction. The rail 414 a has a lower surface that contacts a corresponding one of the drawer guides 147. The roller 414 b may be disposed at the rear end of each of the sliders 414. A rotary shaft of the roller 414 b extends in the leftward-rightward direction. The roller 414 b of each of the sliders 414 contacts a rail 147 a of a corresponding one of the drawer guides 147.

The roller 414 b may move along the rail 147 a in the forward-rearward direction. The rail 147 a supports the lower side of the roller 414 b. The rail 414 a may be moved by the roller 147 b in the forward-rearward direction. The roller 147 b supports the rail 414 a.

The filter housing 140 includes a filter module guide 142 to guide the movement of the upper surface of the filter module 350 and 500 when the filter module 350 and 500 is withdrawn and introduced together with the drawer 400. The filter housing 140 includes a pair of filter module guides 142 disposed at opposite sides thereof. The filter module guides 142 are disposed at the inner upper side of the filter housing 140. The filter module guides 142 have lower surfaces that contact the upper surface of the filter module 350 and 500.

In the state in which the drawer 400 is settled in the filter housing 140, the point at which the roller 147 b is supported is located at the front, and the point at which the rail 147 a is supported is located at the rear. The support points are spaced apart from each other in the forward-rearward direction, whereby the drawer 400 is stably supported.

In the process the drawer 400 is withdrawn from the filter housing 140, the support point of the roller 147 b is not changed. However, in the process the drawer 400 is withdrawn from the filter housing 140, as the roller 414 b moves forward, the support point of the rail 147 a moves forward. The distance between the support point of the roller 147 b and the support point of the rail 147 a is decreased, with the result that the front of the drawer 400 protrudes. In the case in which the electric dust collector 500 and the photo-catalyst filter 350 are located in the drawer 400, the upper surface of the photo-catalyst filter 350 contacts the filter module guides 142 of the filter housing 140 to prevent the front of the drawer 400 from being turned downward.

The filter housing 140 includes a mesh filter guide 146 to guide the withdrawal and introduction of the mesh filter 300. The filter housing 140 includes a pair of mesh filter guides 146 disposed at opposite sides thereof. The mesh filter 300 includes a sliding part 315 a for enabling the mesh filter 300 to move relative to the filter housing 140 in the forward-rearward direction. The mesh filter 300 includes a pair of sliding parts 315 a disposed at opposite sides of the mesh frame 315.

The sliding parts 315 a are formed at the lower side of the mesh frame 315. The sliding parts 315 a have lower surfaces that contact the mesh filter guides 146. The mesh filter guides 146 are provided to guide the movement of the sliding parts 315 a. The mesh filter guides 146 have upper surfaces that contact the sliding parts 315 a. The lower surfaces of the sliding parts 315 a may move in the forward-rearward direction while sliding along the upper surfaces of the mesh filter guides 146.

When viewed from below, the sliding parts 315 a are disposed between the sliders 414. Each of the sliding parts 315 a is disposed further inward than a corresponding one of the sliders 414. When viewed from above, the mesh filter guides 146 are disposed between the drawer guides 147 in the filter housing. Each of the mesh filter guides 146 is disposed further inward than a corresponding one of the drawer guides 147.

The mesh filter guides 146 are disposed lower than the drawer guides 147. The suction port 111, which is connected to the suction channel 101, is defined between the mesh filter guides 146.

One selected from between each drawer guide 147 and each slider 414 includes rollers 147 b and 414 b, and the other selected from between each drawer guide 147 and each slider 414 includes rails 414 a and 147 a that contact the rollers 147 b and 414 b. In this embodiment, the rail 414 a of each slider 414 has a first section and a second section, a description of which will follow. In other embodiments, the first section and the second section may be provided at the rail 147 a of each drawer guide 147. Even in this case, the same effects may be obtained.

Referring to FIGS. 22 and 23, the rail 414 a includes a first section 414 a 1 having a flat surface formed from a first point p1, at which the rail 414 a contacts the roller 147 b when the drawer 400 starts to be introduced into the filter housing 140, to a predetermined point p2. The rail 414 a includes a first section 414 a 1 having a flat surface formed from a predetermined point p1 to a second point p2, at which the rail 414 a contacts the roller 147 b before the front end 400 a 1 of the drawer opening 400 a is introduced into the filter housing 140. The rail 414 a includes a first section 414 a 1 having a flat surface formed from a first point p1, at which the rail 414 a contacts the roller 147 b when the drawer 400 starts to be introduced into the filter housing 140, to a second point p2, at which the rail 414 a contacts the roller 147 b before the front end 400 a 1 of the drawer opening 400 a is introduced into the filter housing 140.

Referring to FIGS. 22 and 23, the rail 414 a includes second sections 414 a 2 and 414 a 3 formed from the second point p2 to a third point p3, at which the rail 414 a contacts the roller 147 b in the state in which the drawer 400 is settled in the inner space of the filter housing 140, the second sections 414 a 2 and 414 a 3 having heights that are different from the height of the first section 414 a 1 in order to raise the frame 410 upward. The second sections 414 a 2 and 414 a 3 have heights that are different from the height of the first section 414 a 1 in order to raise the drawer 400 upward. In this embodiment, in which the first section 414 a 1 and the second sections 414 a 2 and 414 a 3 are formed at each slider 414, the lower surfaces of the second sections 414 a 2 and 414 a 3 are disposed at lower positions than the lower surface of the first section 414 a 1. In other embodiments in which the first section 414 a 1 and the second sections 414 a 2 and 414 a 3 are formed at each drawer guide 147, the upper surfaces of the second sections 414 a 2 and 414 a 3 are disposed at higher positions than the upper surface of the first section 414 a 1.

When the drawer 400, in which the filter module 350 and 500 is located, starts to be introduced into the inner space of the filter housing 140, therefore, a sufficient vertical gap is provided between the drawer 400 and the filter housing 140 for the drawer 400 to be easily inserted into the inner space of the filter housing 140.

In addition, when the front end 400 a 1 of the drawer opening 400 a is introduced into the inner space of the filter housing 140, the drawer 400, in which the filter module 350 and 500 is located, comes into maximally tight contact with the upper surface of the filter housing 140 in order to prevent the front end of the drawer from tilting downward. As a result, the front end 400 a 1 of the drawer opening 400 a is prevented from colliding with the front end of the mesh filter 300 (or the front end of the filter installation opening), which is disposed at the lower side of the front end 400 a 1 of the drawer opening 400 a.

Furthermore, the drawer 400, in which the filter module 350 and 500 is located, is raised upward in the state in which the drawer 400 is settled in the inner space of the filter housing 140, whereby the vertical gap between the drawer 400 and the inner surface of the filter housing 140 is reduced. As a result, the state in which the drawer 400 is located may be accurately maintained, the gap between the drawer 400 and the filter housing 140 is limited to a predetermined level, and accurate contact between electric terminals is achieved.

Referring to FIGS. 22 and 23, the second sections 414 a 2 and 414 a 3 may include a first height-forming part 414 a 2 having a relatively large height difference with the height of the first section 414 a 1 and disposed at a position relatively close to the second point p2. And, the second sections 414 a 2 and 414 a 3 may include a second height-forming part 414 a 3 having a relatively small height difference with the height of the first section 414 a 1 and disposed at a position relatively close to the third point p3. In this embodiment, in which the second sections 414 a 2 and 414 a 3 are formed at each slider 414, the lower surface of the first height-forming part 414 a 2 is disposed at a lower position than the lower surface of the second height-forming part 414 a 3. In other embodiments in which the second sections 414 a 2 and 414 a 3 are formed at each drawer guide 147, the upper surface of the first height-forming part 414 a 2 is disposed at a higher position than the upper surface of the second height-forming part 414 a 3.

The second sections 414 a 2 and 414 a 3 include inclined surfaces that are inclined from the second point p2 in the direction of the third point p3. The first height-forming part 414 a 2 includes an inclined surface that is inclined from the second point p2 in the direction of the third point p3. The first height-forming part 414 a 2 includes an inclined surface that is inclined from the point at which the first height-forming part 414 a 2 encounters the second height-forming part 414 a 3 in the direction of the second point p2.

Referring to FIGS. 17 to 20, the drawer 400 may include a gap prevention part 412 for reducing the gap between the inner surface of the filter housing 140 and the outer surface of the drawer 400. The gap prevention part 412 protrudes in the direction perpendicular to the direction in which the drawer 400 is withdrawn. In the case in which the direction in which the drawer 400 is withdrawn is the forward-rearward direction, the direction perpendicular to the direction in which the drawer 400 is withdrawn may be the upward-downward direction or the leftward-rightward direction. The gap prevention part 412 may be formed in the shape of a rib protruding from the frame 410 and extending in the forward-rearward direction.

The gap prevention part 412 may include a side gap prevention part 412 a protruding from at least one of the opposite side surfaces thereof in the direction perpendicular to the direction in which the drawer 400 is withdrawn. The side gap prevention part 412 a reduces the gap between the inner surface of the filter housing 140 and the opposite side surfaces of the drawer 400. Each side frame 410 a may include a side gap prevention part 412 a protruding to a corresponding side surface of the filter housing 140. The side gap prevention part 412 a may be formed in the shape of a rib protruding from each side frame 410 a to a corresponding side surface of the filter housing 140 and extending in the forward-rearward direction.

The gap prevention part 412 may include a vertical gap prevention part 412 b protruding in the upward-downward direction. The vertical gap prevention part 412 b reduces the vertical gap between the inner surface of the filter housing 140 and the outer surface of the drawer 400. Each side frame 410 a may include a vertical gap prevention part 412 b protruding downward to a corresponding one of the drawer guides 147. The vertical gap prevention part 412 b may be formed in the shape of a rib protruding downward from each side frame 410 a and extending in the forward-rearward direction. The second sections 414 a 2 and 414 a 3 may have the same construction as the vertical gap prevention part 412 b.

In the state in which the drawer 400 is settled in the inner space of the filter housing 140, the gap prevention part 412 contacts the inner surface of the filter housing 140. When the drawer 400 is being withdrawn from the filter housing 140, contact between the gap prevention part 412 and the inner surface of the filter housing 140 is released. In the process that the drawer 400 is withdrawn from the filter housing 140, contact between the gap prevention part 412 and the inner surface of the filter housing 140 is released. That is, the gap prevention part 412 is formed only in a portion of the vertical section of each side frame 410 a. As a result, the gap between the drawer 400 and the inner surface of the filter housing 140 is large when the drawer 400 starts to be inserted into the filter installation opening 133, and the gap between the drawer 400 and the inner surface of the filter housing 140 is small in the state in which the drawer 400 is settled in the inner space of the filter housing 140, whereby the drawer 400 is stably and correctly settled in the inner space of the filter housing 140.

The gap prevention part 412 may include an inclined part formed such that the gap between the drawer 400 and the inner surface of the filter housing 140 is gradually reduced as the drawer 400 is introduced into the inner space of the filter housing 140.

The gap prevention part 412 is disposed at the front side of the portion of the drawer 400 that is inserted into the inner space of the filter housing 140 in the state in which the drawer 400 is settled in the inner space of the filter housing 140. The gap prevention part 412 is disposed at the front side of the frame 410. The gap prevention part 412 is disposed at the front side of each side frame 410 a.

Referring to FIGS. 7 to 10, the electric dust collector 500 includes an electrification unit 510 for electrifying dust particles in the air, a dust collection unit 540 for collecting the dust particles electrified by the electrification unit 510, and a case 501 and 502 for receiving the electrification unit 510 and the dust collection unit 540. The case 501 and 502 may define the external appearance of the electric dust collector 500. The electrification unit 510 may be disposed at the lower side, and the dust collection unit 540 may be disposed at the upper side.

An electric dust collector grip 503 for enabling the user to lift the electric dust collector 500 such that the electric dust collector 500 is separated from the drawer 400 is formed in the case 501 and 502. The electric dust collector grip 503 may be formed in each of the left and right sides of the case 501 and 502. The electric dust collector grips 503 may be depressed in the case 501 and 502.

The case 501 and 502 may include an electrification unit case 501 for defining a space in which the electrification unit 510 is received and a dust collection unit case 502 for defining a space in which the dust collection unit 540 is received. The electrification unit case 501 may be disposed at the lower side, and the dust collection unit case 502 may be disposed at the upper side. The case 501 and 502 is formed such that the space for receiving the electrification unit 510 and the space for receiving the dust collection unit 540 communicate with each other.

In this embodiment, the electrification unit case 501 is disposed at the lower side, and the dust collection unit case 502 is disposed at the upper side. In addition, the electrification unit 510 is disposed at the lower side of the electrification unit 510, and the dust collection unit 540 is disposed at the upper side thereof. However, the present invention is not limited thereto.

The case 501 and 502 has an inlet port 506, through which air containing dust particles is introduced, and an outlet port 507, through which air in the case 501 and 502 is discharged to the outside. The case 501 and 502 may have a plurality of inlet ports 506. The case 501 and 502 may have a plurality of outlet ports 507. In this embodiment, the inlet port 506 is formed in the lower surface of the electrification unit case 501, and the outlet port 507 is formed in the upper surface of the dust collection unit case 502.

Air flows in the direction denoted by reference symbol A. Specifically, air introduced into the air conditioner through the suction channel 101 flows to the filtration channel 102. The air introduced into the filtration channel 102 sequentially passes through the mesh 318 and the drawer opening 400 a. The air that has passed through the drawer opening 400 a is introduced into the case 501 and 502 through the inlet port 506. The air, introduced into the case 501 and 502, sequentially passes through the electrification unit 510 and the dust collection unit 540, and flows upward through the outlet port 507. Subsequently, the air passes through the photo-catalyst operation unit 355.

In other embodiments, the disposition of the components may be changed, and the components may be arranged horizontally. In this case, settings are performed such that air flows from the electrification unit 510 to the dust collection unit 540.

Referring to FIG. 26, the electrification unit 510 may include a wire discharge electrode 521, to which high voltage is applied, and an opposite electrode plate 523 spaced apart from the wire discharge electrode 521. High voltage is applied to the wire discharge electrode 521 such that discharge can occur between the wire discharge electrode 521 and the opposite electrode plate 523.

A plurality of opposite electrode plates 523 may be disposed. The opposite electrode plates 523 may be spaced apart from each other so as to face each other in the state in which the wire discharge electrode 521 is disposed between the respective opposite electrode plates 523.

A plurality of wire discharge electrodes 521 may be disposed. The wire discharge electrodes 521 may be spaced apart from each other so as to be parallel to each other. The opposite electrode plates 523 may be disposed between the respective wire discharge electrodes 521 in the direction perpendicular to the direction in which the wire discharge electrodes 521 are arranged.

FIG. 26 exemplarily shows several wire discharge electrodes 521 and several opposite electrode plates 523 alternately arranged while being spaced apart from each other in the direction X, which is perpendicular to the flow direction A of air. Alternatively, a larger number of wire discharge electrodes 521 and opposite electrode plates 523 may be alternately arranged.

The wire discharge electrodes 521 and the opposite electrode plates 523 may be fixed to the electrification unit case 501. A distance-maintaining structure (not shown) for maintaining the distances between the wire discharge electrodes 521 and the opposite electrode plates 523 may be provided.

When voltage is applied to the wire discharge electrodes 521, corona discharge occurs between the wire discharge electrodes 521 and the opposite electrode plates 523. Dust particles in the air are electrified while the air passes through the electrification unit 510.

Referring to FIG. 27, the dust collection unit 540 includes an electrode 540 a for collecting the electrified dust particles. The dust collection unit 540 includes a plurality of electrodes 541 and 542 to generate an electric field to collect the electrified dust particles. The electrode 540 a may be formed in the shape of a thin plate having a predetermined width, length, and thickness. The electrode 540 a may be formed in the shape of an electrode.

The electrodes 541 and 542 include high-potential electrodes 541, to which relatively high potential is applied, and low-potential electrodes 542, to which relatively low potential is applied. The high-potential electrodes 541 and the low-potential electrodes 542 may be arranged side by side so as to be aligned in the longitudinal direction Y.

The electrodes 541 and 542 are arranged so as to face each other in the state in which gaps S are formed between the respective electrodes. The high-potential electrodes 541 and the low-potential electrodes 542 are alternately arranged in the direction X, which is perpendicular to the lateral direction Z and the longitudinal direction Y in the state in which gaps S are formed between the respective electrodes.

Hereinafter, the circuit of the electric dust collector 500 will be described with reference to FIGS. 24 to 27.

The body 130 includes power terminals 148 a and 148 b for respectively supplying power to the electrification unit 510 and the dust collection unit 540. The body 130 includes ground terminals 149 a and 149 b for respectively grounding the electrification unit 510 and the dust collection unit 540. The power terminals 148 a and 148 b are disposed at the filter housing 140. The ground terminals 149 a and 149 b are also disposed at the filter housing 140.

The power terminals 148 a and 148 b may include an electrification unit power terminal 148 a for supplying power to the electrification unit 510 and a dust collection unit power terminal 148 b for supplying power to the dust collection unit 540. The ground terminals 149 a and 149 b may include an electrification unit ground terminal 149 a for grounding the electrification unit 510 and a dust collection unit ground terminal 149 b for grounding the dust collection unit 540.

The body 130 includes a high-voltage generator 581 generating high voltage. The body includes a high-voltage generator 581 a for generating high voltage to be applied to the electrification unit 510. The body includes a high-voltage generator 581 b generating high voltage to be applied to the dust collection unit 540. The high-voltage generator 581 a is electrically connected to the power terminals 148 a and 148 b.

In this embodiment, the high-voltage generator 581 a and the high-voltage generator 581 b constitute a single high-voltage generator 581. Power from the high-voltage generator 581 is applied to the electrification unit 510 and the dust collection unit 540 in parallel. The body 130 includes a power supply wire 585 for supplying power to the high-voltage generator 581.

The electric dust collector 500 includes power-receiving terminals 518 and 548 and ground-receiving terminals 519 and 549 that respectively contact the power terminals 148 a and 148 b and the ground terminals 149 a and 149 b. The power-receiving terminals 518 and 548 are disposed at the electric dust collector 500. The ground-receiving terminals 519 and 549 are disposed at the electric dust collector 500.

The power terminals 148 a and 148 b, which are connected to the high-voltage generator 581 to respectively supply power to the electrification unit 510 and the dust collection unit 540, are disposed at the filter housing 140. The ground terminals 149 a and 149 b, which are connected to a ground 582 to respectively ground the electrification unit 510 and the dust collection unit 540, are disposed at the body 130.

The electrification unit power terminal 148 a, which is connected to the high-voltage generator 581 a to supply power to the electrification unit 510, is disposed at the filter housing 140. The dust collection unit power terminal 148 b, which is connected to the high-voltage generator 581 b to supply power to the dust collection unit 540, is disposed at the filter housing 140. The electrification unit ground terminal 149 a, which is connected to a ground 582 a to ground the electrification unit 510, is disposed at the filter housing 140. The dust collection unit ground terminal 149 b, which is connected to a ground 582 b to ground the dust collection unit 540, is disposed at the filter housing 140.

The power-receiving terminals 518 and 548, which respectively contact the power terminals 148 a and 148 b to supply power to the electrification unit 510 and the dust collection unit 540, are disposed on the outer surface of the case 501 and 502. The ground-receiving terminals 519 and 549, which respectively contact the ground terminals 149 a and 149 b so as to ground the electrification unit 510 and the dust collection unit 540, are disposed on the outer surface of the case 501 and 502.

The power-receiving terminals 518 and 548 include an electrification unit power-receiving terminal 518 and a dust collection unit power-receiving terminal 548. The ground-receiving terminals 519 and 549 include an electrification unit ground-receiving terminal 519 and a dust collection unit ground-receiving terminal 549.

The electrification unit power-receiving terminal 518, which contacts the electrification unit power terminal 148 a to supply power to the electrification unit 510, is disposed at the outer surface of the case 501 and 502. The dust collection unit power-receiving terminal 548, which contacts the dust collection unit power terminal 148 b to supply power to the dust collection unit 540, is disposed at the outer surface of the case 501 and 502. The electrification unit ground-receiving terminal 519, which contacts the electrification unit ground terminal 149 a to ground the electrification unit 510, is disposed at the outer surface of the case 501 and 502. The dust collection unit ground-receiving terminal 549, which contacts the dust collection unit ground terminal 149 b to ground the dust collection unit 540, is disposed at the outer surface of the case 501 and 502.

In the electric dust collector 500, the power-receiving terminals 518 and 548 are disposed so as to be opposite the ground-receiving terminals 519 and 549. In the electric dust collector 500, the electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 are disposed so as to be opposite the electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549.

The electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 may be disposed in the same horizontal plane so as to be spaced apart from each other diagonally. The electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549 may be disposed in the same horizontal plane so as to be spaced apart from each other diagonally.

When the drawer 400 is introduced into the inner space of the filter housing 140, the power terminals 148 a and 148 b respectively contact the power-receiving terminals 518 and 548, and the ground terminals 149 a and 149 b respectively contact the ground-receiving terminals 519 and 549. In the state in which the drawer 400, in which the electric dust collector 500 is located, is settled in the inner space of the filter housing 140, the power terminals 148 a and 148 b respectively contact the power-receiving terminals 518 and 548, and the ground terminals 149 a and 149 b respectively contact the ground-receiving terminals 519 and 549.

The electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549 are respectively provided at points on the outer surface of the case 501 and 502 that correspond to the electrification unit ground terminal 149 a and the dust collection unit ground terminal 149 b.

On the outer surface of the case 501 and 502, the electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 may be opposite the electrification unit ground-receiving terminal 519 and a dust collection unit ground-receiving terminal 549. The power-receiving terminals 518 and 548 and the ground-receiving terminals 519 and 549 may be respectively disposed at the left and right side surfaces of the case 501 and 502. The electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 may be disposed at the same side surface of the case 501 and 502. The electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549 may be disposed at the same side surface of the case 501 and 502.

Specifically, the power-receiving terminals 518 and 548 and the ground-receiving terminals 519 and 549 are disposed such that the power terminals 148 a and 148 b respectively contact the power-receiving terminals 518 and 548 and such that the ground terminals 149 a and 149 b respectively contact the ground-receiving terminals 519 and 549 only in the state in which the case 501 and 502 is settled in the body 130.

The power terminals 148 a and 148 b are disposed at the side of the inner surface of the filter housing 140 that is oriented perpendicular to the direction in which the drawer 400 is introduced and withdrawn. The ground terminals 149 a and 149 b are disposed at the side of the inner surface of the filter housing 140 that is oriented perpendicular to the direction in which the drawer 400 is introduced and withdrawn.

The power terminals 148 a and 148 b are disposed at one side of the inner surface of the filter housing 140. The power terminals 148 a and 148 b are disposed at one of opposite inner side surfaces of the filter housing 140. The ground terminals 149 a and 149 b are disposed at the other side of the inner surface of the filter housing 140. The ground terminals 149 a and 149 b are disposed at the other of the opposite inner side surfaces of the filter housing 140.

The ground terminals 149 a and 149 b may be disposed at the side of the inner surface of the filter housing 140 opposite the side of the inner surface of the filter housing 140 at which the power terminals 148 a and 148 b are disposed. The electrification unit power terminal 148 a and the dust collection unit power terminal 148 b may be disposed on the same side of the inner surface of the body 130. The electrification unit ground terminal 149 a and the dust collection unit ground terminal 149 b may be disposed on the same side of the inner surface of the body 130.

In the state in which the drawer 400 is settled in the inner space of the filter housing 140, the electrification unit power terminal 148 a contacts the electrification unit power-receiving terminal 518, and the electrification unit ground terminal 149 a contacts the electrification unit ground-receiving terminal 519. In this case, high voltage is applied to the electrification unit 510.

In the state in which the drawer 400 is settled in the inner space of the filter housing 140, the dust collection unit power terminal 148 b contacts the dust collection unit power-receiving terminal 548, and the dust collection unit ground terminal 149 b contacts the dust collection unit ground-receiving terminal 549. In this case, high voltage is applied to the dust collection unit 540.

When the drawer 400 is withdrawn from the inner space of the filter housing 140, the electrification unit power terminal 148 a is separated from the electrification unit power-receiving terminal 518, and the electrification unit ground terminal 149 a is separated from the electrification unit ground-receiving terminal 519. As a result, the application of high voltage to the electrification unit 510 is interrupted.

When the drawer 400 is withdrawn from the inner space of the filter housing 140, the dust collection unit power terminal 148 b is separated from the dust collection unit power-receiving terminal 548, and the dust collection unit ground terminal 149 b is separated from the dust collection unit ground-receiving terminal 549. As a result, the application of high voltage to the dust collection unit 540 is interrupted.

The electric dust collector 500 includes a ground wire 583 a for electrically interconnecting the opposite electrode plate 523 and the ground 582 a. The electric dust collector 500 includes a high-voltage wire 584 a for electrically interconnecting the wire discharge electrode 521 and the high-voltage generator 581 a.

The electrification unit power terminal 148 a and the electrification unit power-receiving terminal 518 are disposed on the high-voltage wire 584 a. The electrification unit power terminal 148 a and the electrification unit power-receiving terminal 518 function as a switch for electrically opening and closing the high-voltage wire 584 a. The electrification unit ground terminal 149 a and the electrification unit ground-receiving terminal 519 are disposed on the ground wire 583 a. The electrification unit ground terminal 149 a and the electrification unit ground-receiving terminal 519 function as a switch for electrically opening and closing the ground wire 583 a.

The electric dust collector 500 includes a ground wire 583 b for electrically interconnecting the low-potential electrodes 542 and the ground 582 b. The electric dust collector 500 includes a high-voltage wire 584 b for electrically interconnecting the high-potential electrodes 541 and the high-voltage generator 581 b.

The dust collection unit power terminal 148 b and the dust collection unit power-receiving terminal 548 are disposed on the high-voltage wire 584 b. The dust collection unit power terminal 148 b and the dust collection unit power-receiving terminal 548 function as a switch for electrically opening and closing the high-voltage wire 584 b. The dust collection unit ground terminal 149 b and the dust collection unit ground-receiving terminal 549 are disposed on the ground wire 583 b. The dust collection unit ground terminal 149 b and the dust collection unit ground-receiving terminal 549 function as a switch for electrically opening and closing the ground wire 583 b.

Referring to FIGS. 11 to 13, the electrification unit power terminal 148 a and the dust collection unit power terminal 148 b are disposed in the plane perpendicular to the sliding direction of the filter assembly 10. The electrification unit ground terminal 149 a and the dust collection unit ground terminal 149 b are disposed in the plane perpendicular to the sliding direction of the filter assembly 10.

The electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 are disposed on the plane perpendicular to the sliding direction of the filter assembly 10. The electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549 are disposed on the plane perpendicular to the sliding direction of the filter assembly 10.

The electrification unit power terminal 148 a and the dust collection unit power terminal 148 b are disposed so as to be positionally different from each other in the direction perpendicular to the direction in which the drawer 400 is introduced and withdrawn. The electrification unit ground terminal 149 a and the dust collection unit ground terminal 149 b are disposed so as to be positionally different from each other in the direction perpendicular to the direction in which the drawer 400 is introduced and withdrawn.

The direction in which the electric dust collector 500 is introduced and withdrawn may be the forward-rearward direction. In this case, the electrification unit power terminal 148 a and the dust collection unit power terminal 148 b are disposed at different heights on the same inner surface of the filter housing 140. The electrification unit ground terminal 149 a and the dust collection unit ground terminal 149 b are disposed at different heights on the same inner surface of the filter housing 140. The electrification unit power-receiving terminal 518 and the dust collection unit power-receiving terminal 548 are disposed at different heights on the same side surface of the electric dust collector 500. The electrification unit ground-receiving terminal 519 and the dust collection unit ground-receiving terminal 549 are disposed at different heights on the same side surface of the electric dust collector 500.

The electrification unit power terminal 148 a and the dust collection unit power terminal 148 b may be disposed at different heights such that the electrification unit power-receiving terminal 518 contacts only the electrification unit power terminal 148 a and the dust collection unit power-receiving terminal 548 contacts only the dust collection unit power terminal 148 b on the forward and rearward movement path of the electrification unit power-receiving terminal 518 and the forward and rearward movement path of the dust collection unit power-receiving terminal 548 upon the withdrawal and introduction of the drawer 400.

During the introduction and withdrawal of the electric dust collector 500, therefore, contact between terminals that do not correspond to each other is prevented, thereby reducing wear due to friction and preventing the undesired supply of power. Particularly, if power is supplied due to contact between the terminals even though the drawer 400 is not settled in the inner space of the filter housing 140 when the electric dust collector 500 is withdrawn, the user may receive an electric shock, which is prevented according to the present invention.

Referring to FIGS. 24 to 27, the filter housing 140 includes a cutoff switch 145 for enabling or disabling the operation of the electric dust collector 500. The cutoff switch 145 may be disposed at the filter housing 140. The cutoff switch 145 enables or disables the supply of power to the high-voltage generator 581. When the cutoff switch 145 is pushed, power may be supplied to the high-voltage generator 581. The cutoff switch 145 may enable or disable the supply of power to other parts of the electric dust collector 500 that need to receive power (e.g. a sensor, a display, and a motor).

The cutoff switch 145 enables the operation of the air freshener 100 only in the state in which the electric dust collector 500 and the drawer 400 are settled in the filter housing 140. When the electric dust collector 500 and the drawer 400 are separated from the filter housing 140, the cutoff switch 145 disables the operation of the air freshener 100. The cutoff switch 145 disables the operation of the air freshener 100 in the state in which the electric dust collector 500 and the drawer 400 are not fully coupled to the filter housing 140 (i.e. in which the electric dust collector 500 and the drawer 400 are not settled in the filter housing 140).

The cutoff switch 145 is disposed on the power supply wire 585. The cutoff switch 145 enables or disables the supply of power to the high-voltage generators 581 a and 581 b. When the cutoff switch 145 is pushed, the power supply wire 585 may be short-circuited. When the cutoff switch 145 is not pushed, the power supply wire 585 may be open-circuited.

The cutoff switch 145 may be disposed at the inner surface of the filter housing 140. The cutoff switch 145 may be disposed at the inner surface of the filter housing 140 in the direction in which the case 501 and 502 is inserted into the body 130. The cutoff switch 145 may be disposed at the rear side of the inner surface of the filter housing 140. The cutoff switch 145 may be configured to be pushed in the direction in which the case 501 and 502 is inserted into the body 130.

The filter assembly 10 includes a cutoff protrusion 144 for pushing the cutoff switch 145. The cutoff protrusion 144 is disposed at the side of the filter assembly 10 in the direction in which the drawer 400 is inserted into the filter housing 140. The cutoff protrusion 144 protrudes in the direction in which the electric dust collector 500 is introduced. The cutoff protrusion 144 is configured to push the cutoff switch 145 in the state in which the filter assembly 10 is settled in the inner space of the filter housing 140. When the cutoff protrusion 144 pushes the cutoff switch 145, the power supply wire 585 is short-circuited, whereby power may be supplied to the high-voltage generator 581. As a result, it is possible to prevent the user from receiving an electric shock when the user contacts the power terminals 148 a and 148 b and the ground terminals 149 a and 149 b in the state in which the filter assembly 10 is separated from the filter housing 140. The electric dust collector 500 may include a cutoff protrusion 144. The cutoff protrusion 144 may be configured to push the cutoff switch 145 in the state in which the drawer 400 is settled in the inner space of the filter housing 140.

A plurality of cutoff switches 145 may be connected to each other in series. The filter housing 140 may include a first cutoff switch 145 a and a second cutoff switch 145 b, which are connected to each other in series. When both the first cutoff switch 145 a and the second cutoff switch 145 b are pushed, power may be supplied. The first cutoff switch 145 a and the second cutoff switch 145 b enable or disable the supply of power to the electric dust collector 500.

The cutoff protrusion 144 includes a first cutoff protrusion 144 a protruding from the filter assembly 10 for pushing the first cutoff switch 145 a and a second cutoff protrusion 144 b protruding from the filter assembly 10 for pushing the second cutoff switch 145 b.

The electric dust collector 500 may include a first cutoff protrusion 144 a protruding so as to push the first cutoff switch 145 a in the state in which the drawer 400 is settled in the inner space of the filter housing 140. The first cutoff protrusion 144 a protrudes in the direction in which the electric dust collector 500 is introduced.

The mesh filter 300 may include a second cutoff protrusion 144 b protruding so as to push the second cutoff switch 145 b in the state in which the mesh filter 300 is settled in the inner space of the filter housing 140. The second cutoff protrusion 144 b protrudes in the direction in which the mesh filter 300 is introduced.

Referring to FIGS. 24 to 27, the electric dust collector 500 includes a short-circuit switch 600 configured such that the high-potential electrodes 541 and the low-potential electrodes 542 are short-circuited when it is turned ON and such that the high-potential electrodes 541 and the low-potential electrodes 542 are not short-circuited when it is turned OFF. Specifically, the high-potential electrodes 541 are connected to each other in parallel, and a short-circuit wire 600 a is electrically connected to one end of the short-circuit switch 600 at the parallel connection point of the high-potential electrodes 541. In addition, the low-potential electrodes 542 are connected to each other in parallel, and a short-circuit wire 600 b is electrically connected to the other end of the short-circuit switch 600 at the parallel connection point of the low-potential electrodes 542. The short-circuit switch 600 is disposed on the short-circuit wires 600 a and 600 b.

The short-circuit switch 600 is turned OFF in the state in which the drawer 400, in which the electric dust collector 500 is located, is settled in the filter housing 140. The short-circuit switch 600 is turned ON in the state in which the drawer 400, in which the electric dust collector 500 is located, is separated from the filter housing 140.

In the state in which the drawer 400 is separated from the inner space of the filter housing 140, the high-potential electrodes 541 and the low-potential electrodes 542 are short-circuited, whereby electric charge in the dust collection unit 540 is discharged. When the pushed state of the short-circuit switch 600 is released, the high-potential electrodes 541 and the low-potential electrodes 542 are short-circuited.

In the state in which the drawer 400 is settled in the inner space of the filter housing 140, the short-circuited state of the high-potential electrodes 541 and the low-potential electrodes 542 is released, whereby electric charge is formed in the dust collection unit 540 such that an electric field can be generated.

The filter housing 140 includes a short-circuit protrusion 141 for pushing the short-circuit switch 600 in the state in which the drawer 400 is settled in the inner space of the filter housing 140. The short-circuit protrusion 141 protrudes in the direction in which the drawer 400 is withdrawn.

The short-circuit protrusion 141 is disposed at the side of the inner surface of the filter housing 140 that faces the direction in which the drawer 400 is inserted into the filter housing 140. The short-circuit protrusion 141 is disposed at the rear side of the inner surface of the filter housing 140.

The short-circuit switch 600 includes a pressurization part 626 exposed at the position corresponding to the short-circuit protrusion 141, pressurization part 626 configured to be pushed in the state in which the case 501 and 502 is separated from the body 130. The short-circuit switch 600 may include an elastic member disposed at the side of the pressurization part 626 opposite the pressurization surface thereof. When the pressurization part 626 is pushed, the elastic member is elastically compressed. When the pushed state of the pressurization part 626 is released, the elastic member is restored.

A plurality of short-circuit switches 600 may be provided. The electric dust collector 500 may include a plurality of short-circuit switches 600.

The short-circuit switches 600 are connected to each other in parallel by the short-circuit wires 600 a and 600 b.

When at least one of the short-circuit switches 600 is short-circuited, the high-potential electrodes 541 and the low-potential electrodes 542 are short-circuited. Even in the case in which one of the short-circuit switches 600 is not normally short-circuited due to the presence of foreign matter or breakage, therefore, the high-potential electrodes 541 and the low-potential electrodes 542 are short-circuited as long as at least another of the short-circuit switches 600 is normally short-circuited, thereby further improving the user's safety.

In this embodiment, the electric dust collector 500 includes two short-circuit switches 600-1 and 600-2. The short-circuit switches 600-1 and 600-2 may be arranged so as to be spaced apart from each other horizontally. The electric dust collector 500 may include a first short-circuit switch 600-1 and a second short-circuit switch 600-2.

The first short-circuit switch 600-1 includes a first pressurization part 652-1 disposed at the outer surface of the case 501 and 502. The second short-circuit switch 600-2 includes a second pressurization part 652-2 disposed at the outer surface of the case 501 and 502. The first short-circuit switch 600-1 and the second short-circuit switch 600-2 are arranged so as to be spaced apart from each other.

The filter housing 140 includes a plurality of short-circuit protrusions 141 a and 141 b respectively formed at the positions corresponding to the pressurization parts 652-1 and 652-2. The short-circuit protrusions 141 a and 141 b may include a first short-circuit protrusion 141 a for pushing the first short-circuit switch 600-1 and a second short-circuit protrusion 141 b for pushing the second short-circuit switch 600-2. In the state in which the drawer 400, in which the electric dust collector 500 is located, is settled in the inner space of the filter housing 140, the short-circuit protrusions 141 a and 141 b push the pressurization parts 652-1 and 652-2, respectively.

As is apparent from the above description, according to the present invention, the filter module may be easily separated from the air freshener, washed, and reintroduced into the air freshener. Particularly, in the case in which the filter module includes a plurality of filters, the drawer may be introduced and withdrawn in the state in which all of the filters may be disposed in the drawer, with the result that all of the filters may be introduced and withdrawn at once.

In addition, the drawer is configured such that when the drawer, in which the filter module is located, starts to be introduced into the inner space of the filter housing, a sufficient gap is provided between the drawer and the filter housing for the drawer to be easily inserted into the inner space of the filter housing, and such that in the state in which the drawer is settled in the filter housing, the gap is minimized, thereby achieving accurate contact of the power terminals.

In addition, the power circuit of the cutoff switch is opened when the electric dust collector is withdrawn from the filter housing, thereby greatly reducing the possibility of an electric shock when not in use. Furthermore, the mesh filter of the electric dust collector is disposed in the inlet port, and the second cutoff switch is formed at the mesh filter, thereby greatly reducing the possibility of an electric shock when the electric dust collector is used.

In addition, the mesh filter may be separated from the electric dust collector in order to wash the mesh filter, whereby it is possible to easily wash the mesh filter while ensuring safety against an electric shock.

In addition, external air may flow to the sensors due to negative pressure of the air without providing additional fans to the sensors. Furthermore, the cleaning hole in the dust sensor is opened and closed by the filter cover of the drawer, with the result that it is not necessary to provide an additional dust sensor opening and closing structure in addition to the drawer.

In addition, the user's hand is completely isolated from the front and the upper side of the air freshener by the provision of the filter cover, thereby making it easy to sense information about air in front of the air conditioner while reducing the possibility of an electric shock.

Effects of the present invention are not limited to the aforementioned effects, and other unmentioned effects will be clearly understood by those skilled in the art from the claims.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 

What is claimed is:
 1. An air freshener comprising: the body case forming a filter installation opening in one side thereof; a filter housing disposed in the body case; a drawer comprising a frame forming therein a drawer opening, through which air passes, and a filter cover coupled to the frame for covering the filter installation opening; and a filter module separably located on the frame for filtering the air that has passed through the drawer opening, wherein the drawer is configured to be withdrawn from an inner space of the filter housing through the filter installation opening.
 2. The air freshener according to claim 1, wherein the air freshener is configured such that air passes through the drawer opening and the filter module in an upward-downward direction in a state in which the drawer is settled in the inner space of the filter housing.
 3. The air freshener according to claim 1, wherein the filter module comprises a plurality of filters stacked so as to be separated from each other.
 4. The air freshener according to claim 1, wherein the frame comprises a pair of side frames configured to slide relative to the filter housing in a forward-rearward direction, the drawer opening being defined between the side frames.
 5. The air freshener according to claim 4, wherein the filter cover is disposed at front end portions of the side frames, and the frame comprises: a rear frame for interconnecting rear end portions of the side frames; and a front frame for interconnecting the front end portions of the side frames, the front frame being coupled to a rear surface of the filter cover.
 6. The air freshener according to claim 5, wherein the side frames, the rear frame, and the front frame have location surfaces on which the filter module is located, and the location surfaces of the side frames are disposed at a height different from a height of at least one of the location surfaces of the rear and front frames.
 7. The air freshener according to claim 1, wherein the filter housing comprises a pair of drawer guides disposed at opposite sides thereof for guiding withdrawal and introduction of the frame, and the drawer comprises a pair of sliders disposed at opposite sides of the frame, the sliders being configured to move along the drawer guides.
 8. The air freshener according to claim 7, further comprising: a mesh filter configured to be withdrawn from the inner space of the filter housing independent of the drawer, wherein the filter housing further comprises a mesh filter guide for guiding withdrawal and introduction of the mesh filter, the mesh filter guide being disposed between the drawer guides in the filter housing so as to be lower than the drawer guides.
 9. The air freshener according to claim 7, wherein the filter housing further comprises a filter module guide disposed at an inner upper side thereof for guiding movement of an upper surface of the filter module when the filter module is withdrawn and introduced together with the drawer.
 10. The air freshener according to claim 7, wherein one selected from between each drawer guide and a corresponding slider comprises a roller, the other selected from between the drawer guide and the slider comprises a rail, which the roller contacts, and the rail comprises: a first section having a flat surface formed from a first point at which the rail contacts the roller when the drawer starts to be introduced into the inner space of the filter housing to a second point at which the rail contacts the roller before a front end of the drawer opening is introduced into the inner space of the filter housing; and a second section formed from the second point to a third point at which the rail contacts the roller in a state in which the drawer is settled in the inner space of the filter housing, the second section having a height different from a height of the first section so as to raise the frame upward.
 11. The air freshener according to claim 10, wherein the second section comprises: a first height-forming part having a relatively large height difference with the height of the first section and disposed at a position relatively close to the second point; and a second height-forming part having a relatively small height difference with the height of the first section and disposed at a position relatively close to the third point.
 12. The air freshener according to claim 1, wherein the filter module comprises an electric dust collector, the air freshener further comprises a mesh filter disposed in a direction in which an inlet port of the electric dust collector is formed, the mesh filter being withdrawn from the inner space of the filter housing independent of the drawer, the filter housing comprises a first cutoff switch and a second cutoff switch for enabling or disabling a supply of power to the electric dust collector, the first cutoff switch and the second cutoff switch being connected to each other in series to enable the supply of power to the electric dust collector only when both are pushed, the electric dust collector comprises a first cutoff protrusion protruding from the electric dust collector for pushing the first cutoff switch when the drawer is introduced into the inner space of the filter housing, and the mesh filter comprises a second cutoff protrusion protruding from the mesh filter for pushing the second cutoff switch when the mesh filter is introduced into the inner space of the filter housing.
 13. The air freshener according to claim 1, wherein the frame is coupled to a lower part of the filter cover, and the filter cover extends perpendicular to the frame.
 14. The air freshener according to claim 1, wherein the filter cover comprises: a front part having a grip; a rear part that contacts a front surface of the filter module; and a top part disposed between the rear part and the front part, the top part facing an inner upper surface of the filter housing.
 15. The air freshener according to claim 14, wherein the filter cover further comprises: a catching part disposed at the top part for allowing the drawer to be caught by the filter housing in a state in which the drawer is settled in the inner space of the filter housing; and a catching release button disposed at the grip for releasing a caught state of the catching part.
 16. The air freshener according to claim 1, wherein the filter cover comprises an upper extension formed so as to be higher than the filter installation opening by a predetermined distance, the upper extension forming a sensor hole, and the air freshener further comprises a sensor module disposed at a rear side of the upper extension for sensing specific information from air introduced through the sensor hole.
 17. The air freshener according to claim 16, wherein the sensor module comprises a plurality of sensors, and the sensor hole extends in a direction in which the sensors are arranged.
 18. The air freshener according to claim 16, wherein the body case comprises a depression formed so as to be engaged with the upper extension in a state in which the drawer is settled in the inner space of the filter housing.
 19. The air freshener according to claim 16, wherein the sensor module comprises a dust sensor for sensing concentration of dust, the body case forms a cleaning hole for cleaning an interior of the dust sensor, an inlet hole, through which air is introduced into the dust sensor, and an outlet hole, through which air is discharged from the dust sensor, the sensor hole is formed at a position corresponding to the inlet hole and the outlet hole, and the upper extension is configured to open and close the cleaning hole upon withdrawal and introduction of the drawer.
 20. The air freshener according to claim 19, wherein the dust sensor comprises a heating unit for applying heat to air introduced into the dust sensor, the inlet hole, the cleaning hole, and the outlet hole are arranged upward in due order, the sensor hole is configured to have a shape of a slit formed at a position corresponding to at least one of the inlet and outlet holes so as to extend in a leftward-rightward direction, and the sensor module comprises a plurality of sensors arranged in a longitudinal direction of the slit. 